My current emacs version is 27.2, OS is Ubuntu 20.04,Java version is 11.0.11.
I was following the official guide of installing metals on emacs, did a little change from the course at the start (I first installed required packages/dependencies through M-x package-list-packages and only then did what was going on on the guide, but from my understanding, it shouldn't matter. My current init.el file contains the code related to lsp-mode:
;; Install use-package if not already installed
(unless (package-installed-p 'use-package)
(package-refresh-contents)
(package-install 'use-package))
(require 'use-package)
;; Enable defer and ensure by default for use-package
;; Keep auto-save/backup files separate from source code: https://github.com/scalameta/metals/issues/1027
(setq use-package-always-defer t
use-package-always-ensure t
backup-directory-alist `((".*" . ,temporary-file-directory))
auto-save-file-name-transforms `((".*" ,temporary-file-directory t)))
;; Enable scala-mode for highlighting, indentation and motion commands
(use-package scala-mode
:interpreter
("scala" . scala-mode))
;; Enable sbt mode for executing sbt commands
(use-package sbt-mode
:commands sbt-start sbt-command
:config
;; WORKAROUND: https://github.com/ensime/emacs-sbt-mode/issues/31
;; allows using SPACE when in the minibuffer
(substitute-key-definition
'minibuffer-complete-word
'self-insert-command
minibuffer-local-completion-map)
;; sbt-supershell kills sbt-mode: https://github.com/hvesalai/emacs-sbt-mode/issues/152
(setq sbt:program-options '("-Dsbt.supershell=false"))
)
;; Enable nice rendering of diagnostics like compile errors.
(use-package flycheck
:init (global-flycheck-mode))
(use-package lsp-mode
;; Optional - enable lsp-mode automatically in scala files
:hook (scala-mode . lsp)
(lsp-mode . lsp-lens-mode)
:config
;; Uncomment following section if you would like to tune lsp-mode performance according to
;; https://emacs-lsp.github.io/lsp-mode/page/performance/
;; (setq gc-cons-threshold 100000000) ;; 100mb
;; (setq read-process-output-max (* 1024 1024)) ;; 1mb
;; (setq lsp-idle-delay 0.500)
;; (setq lsp-log-io nil)
;; (setq lsp-completion-provider :capf)
(setq lsp-prefer-flymake nil))
;; Add metals backend for lsp-mode
(use-package lsp-metals)
;; Enable nice rendering of documentation on hover
;; Warning: on some systems this package can reduce your emacs responsiveness significally.
;; (See: https://emacs-lsp.github.io/lsp-mode/page/performance/)
;; In that case you have to not only disable this but also remove from the packages since
;; lsp-mode can activate it automatically.
(use-package lsp-ui)
;; lsp-mode supports snippets, but in order for them to work you need to use yasnippet
;; If you don't want to use snippets set lsp-enable-snippet to nil in your lsp-mode settings
;; to avoid odd behavior with snippets and indentation
(use-package yasnippet)
;; Use company-capf as a completion provider.
;;
;; To Company-lsp users:
;; Company-lsp is no longer maintained and has been removed from MELPA.
;; Please migrate to company-capf.
(use-package company
:hook (scala-mode . company-mode)
:config
(setq lsp-completion-provider :capf))
;; Use the Debug Adapter Protocol for running tests and debugging
(use-package posframe
;; Posframe is a pop-up tool that must be manually installed for dap-mode
)
(use-package dap-mode
:hook
(lsp-mode . dap-mode)
(lsp-mode . dap-ui-mode)
)
without the first part of adding melpa, since I got it added already. After doing everything and restarting the Emacs, I proceeded with opening .scala file and on open I get a debug message:
Debugger entered--Lisp error: (void-function -compose)
-compose(lsp--client-path->uri-fn lsp--workspace-client)
lsp--path-to-uri("pathtoemacs/.emacs.d/index.sqlite")
#f(compiled-function () #<bytecode 0x15566aea7e91>)()
funcall(#f(compiled-function () #<bytecode 0x15566aea7e91>))
eval((funcall #'#f(compiled-function () #<bytecode 0x15566aea7e91>)))
custom-initialize-reset(lsp-serenata-index-database-uri (funcall #'#f(compiled-function () #<bytecode 0x15566aea7e91>)))
custom-declare-variable(lsp-serenata-index-database-uri (funcall #'#f(compiled-function () #<bytecode 0x15566aea7e91>)) "The location to store the index database.\nNote tha..." :group lsp-serenata :ty$
byte-code("\301\302\303\304 \305\306\307!\310\311\312\313&\10!\210\314\315\316\317\320\321\322\323\324\325&\11\210\326\327\330\331\332DD\333\334\335\320\315\324\336&\11\210\326\337\330..." [lsp-intele$
require(lsp-php nil t)
#f(compiled-function (package) #<bytecode 0x15566ad2cc81>)(lsp-php)
mapc(#f(compiled-function (package) #<bytecode 0x15566ad2cc81>) (ccls lsp-actionscript lsp-ada lsp-angular lsp-bash lsp-beancount lsp-clangd lsp-clojure lsp-cmake lsp-crystal lsp-csharp lsp-css lsp-d $
seq-do(#f(compiled-function (package) #<bytecode 0x15566ad2cc81>) (ccls lsp-actionscript lsp-ada lsp-angular lsp-bash lsp-beancount lsp-clangd lsp-clojure lsp-cmake lsp-crystal lsp-csharp lsp-css lsp-$
lsp--require-packages()
lsp()
run-hooks(change-major-mode-after-body-hook prog-mode-hook scala-mode-hook)
apply(run-hooks (change-major-mode-after-body-hook prog-mode-hook scala-mode-hook))
run-mode-hooks(scala-mode-hook)
scala-mode()
set-auto-mode-0(scala-mode nil)
set-auto-mode()
normal-mode(t)
after-find-file(nil t)
find-file-noselect-1(#<buffer test.scala> "~/Scala/test.scala" nil nil "~/Python_rofli/Scala/test.scala" (5288230 2065))
find-file-noselect("~/Scala/test.scala" nil nil)
ido-file-internal(raise-frame)
ido-find-file()
funcall-interactively(ido-find-file)
call-interactively(ido-find-file nil nil)
command-execute(ido-find-file)
I can try to open the .scala file again and it will be opened, but upon trying to activate lsp-mode, it will tell [Disabled] and a bunch of other errors about not having a connection to the server. And according to the debug message, I am supposed to have some kind of index.sqlite inside my .emacs.d folder, but I don't have one, and creating one didn't help. I also followed the alternative LSP server listed there, the "Eglot", and it worked fine, but upon switching back to lsp-mode variant, it was still giving the same error. Any idea how to start debugging this mess? I tried to manually install metals, tried shenanigans with a "coursier", nothing helped.
